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SimpleWebServer takes a fail-safe stance. If an attacker can force the web server to run out of memory, it will crash, but it will not do something insecure such as skipping an access control check or serving any document requested. How can the attacker force the web server to run out of memory Note that the way that the preceding serveFile() method works is that it uses a StringBuffer object (line 89) to store the contents of the file request prior to sending the data in the file to the client. Lines 117 to 120 load the contents of the file into the StringBuffer, and line 121 outputs all the content accumulated by the StringBuffer to the OutputStreamWriter object. In writing the code as such, the programmer assumes that the file is of finite length, and can be loaded in its entirety before it is sent to the client. Many files are of finite length. However, some files, such as live media streams from a web camera, may not be finite, or should at least be served a little bit at a time instead of all at once. If the attacker can somehow request an infinite-length file, the contents of the file will be put into the StringBuffer until the web server process runs out of memory. While the machine that the web server is running on might not be connected to a web camera, if it is a Linux machine, there is (luckily for the attacker) an infinite-length file that the attacker can use. In Linux, /dev/random is a file that returns random bits that could, for example, be used to generate cryptographic keys (see Section 14.2.3). However, an attacker can misuse it as a source of

That API works going forward in ASP.NET MVC. The only difference is that the Response property of the controller is HttpResponseBase, rather than the sealed HttpResponse class in Web Forms. You can test actions that use cookies much as we tested against the Cache or Session in previous sections.

The MyMarquee widget includes a number of public functions. The most important is my_marquee_slide(), which will move the message speed pixels to the left when called. The programmer can cause a marquee effect by adding this function as a timeout, calling it at a specified interval of time. Listing 11-25. Sliding the MyMarquee Message void my_marquee_slide (MyMarquee *marquee) { PangoFontDescription *fd; GtkWidget *widget; MyMarqueePrivate *priv; PangoLayout *layout; PangoContext *context; gint width, height;

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Sometimes you need data to be stored for a single web request only. Because individual requests are served by threads, it might be tempting to put a [ThreadStatic] attribute on a piece of data and expect it to work. But ASP.NET occasionally reuses threads for other requests, so this is a poor choice for ASP.NET if you want to avoid mixing data in requests from two separate users.

g_return_if_fail (marquee != NULL); g_return_if_fail (IS_MY_MARQUEE (marquee)); widget = GTK_WIDGET (marquee); priv = MY_MARQUEE_GET_PRIVATE (marquee); fd = widget->style->font_desc; context = gdk_pango_context_get (); layout = pango_layout_new (context); g_object_unref (context); /* Create a new PangoLayout out of the message with the given font. */ pango_layout_set_font_description (layout, fd); pango_layout_set_text (layout, priv->message, -1); pango_layout_get_size (layout, &width, &height); /* Clear the text from the background of the widget. */ gdk_window_clear_area (widget->window, 0, 0, widget->allocation.width, widget->allocation.height); /* Scroll the message "speed" pixels to the left or wrap around. */ priv->current_x = priv->current_x - priv->speed; if ((priv->current_x + (width / PANGO_SCALE)) <= 0) priv->current_x = widget->allocation.width; /* Draw the PangoLayout on the widget, which is the message text. */ gdk_draw_layout (widget->window, widget->style->fg_gc[widget->state], priv->current_x, (widget->allocation.height - (height / PANGO_SCALE)) / 2, layout); } You will notice that this function is very similar to the expose function that was previously implemented. Let us look at the differences between the two functions. This function must calculate the new position of the text, which is the current location minus the speed property value. We then need to check whether the message is still visible on the screen. If it has moved beyond the left bound of the widget, the position will be reset to the right side of the widget, which loops the scrolling message. At this point, the drawing can be done just like it was in my_marquee_expose().

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